The Influence of Notch Depth on the Response of Local Sharp-Notched Circular Tubes under Cyclic Bending

Kuo-Long Lee^*, Ching-Hsun Meng, Wen-Fung Pan

Department of Engineering Science, National Cheng Kung University, Tainan.

DOI: 10.4236/jamp.2014.26040                

Abstract

In this paper, the mechanical behavior and buckling failure of SUS304 stainless steel tubes with different local sharp-notched depths subjected to cyclic bending were experimentally investigated. It can be seen that the experimental moment-curvature relationship exhibits cyclic hardening and becomes a steady loop after a few cycles. However, the experimental ovalization-curvature relationship exhibits an increasing and ratcheting manner with the number of the bending cycles. In addition, higher notch depth of a tube leads to a more severe unsymmetrical trend of the ovalization-curvature relationship. It has been observed that the notch depth has almost no influence on the moment-curvature relationship. But, it has a strong influence on the ovalization-curvature relationship. Finally, the theoretical model proposed by Kyriakides and Shaw [1] was used in this study for simulating the controlled curvature-number of cycles to produce buckling relationship. Through comparison with the experimental data, the theoretical model can properly simulate the experimental findings

Keywords

Circular Tube, Local Sharp Notch, Notch Depth, Cyclic Bending

Conflicts of Interest

The authors declare no conflicts of interest.

References

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